Tungsten carbide Ball Plug Gages are quick and easy to use because they can be inserted at any angle. "Go" gages go freely and "no go" gages won't bind. They are particularly effective for giving a feel for bell-mouth, barrel or taper problems. These gages are widely used for spherical seat and bearing race "go" and "no go" gages. They are available in 4,550 sizes from 0.050" in 0.0001" increments. The polished tungsten carbide balls feature class Z tolerance and are mounted on stainless steel shanks.